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IP Listed on SORBS DUL DNSBL Check
x402
IP Listed on SORBS DUL DNSBL Check is a paid API for AI agents from ip.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-09).
Checks whether a given IPv4 address is listed on the SORBS DUL (Dial-Up List) DNS blocklist at dul.dnsbl.sorbs.net and returns listed status, return codes, and reason text.
Price / call$0.01
Success—
StatusUnknown
How this service works
Is this IPv4 address listed on sorbs dul (dul.dnsbl.sorbs.net)? Performs the DNSBL query (reversed octets under dul.dnsbl.sorbs.net, via Cloudflare DoH) and returns listed yes/no with the return codes and, where the list publishes one, the reason text. One list, one precise answer. $0.01 per lookup.
Output
Returns whether the IPv4 address is listed on SORBS DUL (yes/no), the DNSBL return codes, and the reason text published by the list if available.
Example use cases
Email server spam filter validation
“Before accepting this email, can you check if the sending IP 198.51.100.22 is listed on the SORBS DUL blocklist? I want to know if it's flagged as a dynamic or dial-up address.”
Outbound mail deliverability check
“I'm troubleshooting why our emails are being rejected — can you look up whether our server IP 203.0.113.10 appears on the SORBS DUL list and what reason code it returns?”
Suspicious connection investigation
“We got an inbound connection from 185.220.101.5 and I want to know if it's on the SORBS dial-up user list — can you do a DNSBL lookup and give me the result including any reason text?”
Technical details
Endpoint
GEThttps://ip.intel.rallylive.ca/ip/blacklist/sorbs-dul?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a precise, single-list check specifically against the SORBS DUL (dynamic/dial-up) blocklist, rather than a broad multi-list reputation check. Ideal for email security pipelines, spam filtering, and identifying dynamic IP ranges where SORBS DUL is the authoritative reference.
Side effects
- Invalid or non-routable IPv4 address provided — returns error or no result
- SORBS DUL service unavailable — DNS query fails via Cloudflare DoH
- IPv6 address provided — endpoint only supports IPv4
- Network timeout reaching Cloudflare DoH resolver
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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